<root><x xmlns="ns" Id="_0"/><y z_attr="value" a_attr1="foo" Id="_1"/><z><ns:w ns:attr="value" xmlns:ns="myns" Id="_2"/></z><Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/><Reference URI="#_0"><Transforms><Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><DigestValue>b5GCZ2xpP5T7tbLWBTkOl4CYupQ=</DigestValue></Reference><Reference URI="#_non_existing"><Transforms><Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><DigestValue>K4dI497ZCxzweDIrbndUSmtoezY=</DigestValue></Reference><Reference URI="#_2"><Transforms><Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><DigestValue>sH1gxKve8wlU8LlFVa2l6w3HMJ0=</DigestValue></Reference></SignedInfo><SignatureValue>PI2xGt3XrVcxYZ34Kw7nFdq75c7Mmo7J0q7yeDhBprHuJal/KV9KyKG+Zy3bmQIxNwkPh0KMP5r1YMTKlyifwbWK0JitRCSa0Fa6z6+TgJi193yiR5S1MQ+esoQT0RzyIOBl9/GuJmXx/1rXnqrTxmL7UxtqKuM29/eHwF0QDUI=</SignatureValue></Signature></root>